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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45d027e5133e2e5a13a01c4fa2511b3a113be201c1fc1b3972b32f9dcb3a47e0' 
  AND token = 'A5FLa5VEvrBxv7pBD1uhfmiUdBOJM22wfKlT95aFqTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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