SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a764b4f0f29d20bd8e39614588c035393d9800a1694faabc334cebbfa3b1809' 
  AND token = '9UtBv7BLcp6+J15CglO/iwq8Qb8ij7W1cmDBDDuBHg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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