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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9434d52f2e12b17bdb6e56cf87af3e89d11d35f3f07e4964abac8f578d570c35' 
  AND token = 'C3UqOI2KMBbBkh84kd/GPo0P58S3nrm9yWUfcTzZmA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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