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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f3825854086f8a686113262afa276b61c68fb3354095134e91b477cdbb6967df' 
  AND token = 'Vv32l56TSNUipd/AorcKJAgtqPUgSu0W6HrSIWTRTSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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