SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19b32a6d6411b1ff7d6f9170be9c509d5b2e303edc4e5f78b773bda888877e65' 
  AND token = 'kk+KC6HY77Jj4wEWSKpKU9wlKTCSJzzAB/03VrE9CYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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