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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a3f1bb24448e23ad930e59852c84abba63999b7f1fc29d2df895a3dfa123b6c' 
  AND token = 'kPE87Ct7cREFeP2mo8Z5Jubo2vQuWZx4uaruhj2TUNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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