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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2dc990a81ea7691af52399cd52e1e7822d3e3814d61ec6d4dcae363a5ec6b71' 
  AND token = 'QZqjECqtsHiKgdM55PIaV1lno1P2thwxgtc7HkuWLhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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