SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '458ef4efe30d4035f06ec34752b3b567441196428647777aad97b6511366a0b1' 
  AND token = 'C7BEO/RjjssDk7qgqE0z23sTZgJTblKuNsgrXnFsOJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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