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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8baf41d697e6a919ccb1802fa393553033b463e747de529c7f6ede490e2ccddf' 
  AND token = 'w5Zw1dKKf4BsXHcfR6G3v2LIQApIQ7OlmjCFn97t58U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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