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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1557840b346c2dd03fb7921d742bff8d7c60c7a79f2ccca5e8ab777296ee164' 
  AND token = 'bHY9a778p3m82I7/A3E8HAobbbjiurToRX1MCQge9Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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