SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efda2004ffd019bd163c52325e353cc9c9e3bad409fe7da6e76c981435d38d83' 
  AND token = 'oYC8StgvHsnugFQobbblwjH3qJ1XGFrJGFkNKQQKm5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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