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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '813074c67e9232838588391df43905cf06c3856f784d5641f6dd418a0953fbbd' 
  AND token = '8fjY4AJDCo1b28Srpvx01UTNmMIW349v+OB9LiD8AOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}