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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af21848b49e773ba9024df495bf4ca0a447a085447ed9eda71c0118a4eb4a87f' 
  AND token = 'scPH80gP6sxqtyUGTzCtWruqMWl0riQxpbURrjf0jaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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