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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba6bff34ded393b4ba90171ef12e63fa2464829d169139f8fbdb58ed4e2d5883' 
  AND token = 'e3lJQhmvx+uBesD2Hhg5k93pwdYxDoymTcwgx3d4B+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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