SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7358838258aead32773396ab5f40749e88f0f9a063a8f849009b8436c35c410b' 
  AND token = 'jVoYmsPgGaKLF28KVpgefK/dpvufJ0SpTcX6dvRF63s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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