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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef23d86b81123d9dbdf8030bd837bd3bec30f9cbeafffc3f9a93b6432d0c9a44' 
  AND token = 'jbLZJJheK798NxOuioBRjWn5X6o/TLibFdM7It6QpQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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