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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef41c0bc853dff1f2ca2d5ea7a23af1f73c7f4b88080b724a19cc9057c8eae01' 
  AND token = 'Ig+XD0FPsgQQdMMD496B+PyTmHFTmMEf07u/NaC1WqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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