SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70e7777f239da763842102ddb4a2b0ee6b85e9f81ba9d82d0df6c3e2cdff3d3b' 
  AND token = '4gm1GJlUS2N69cKNVX6qLR8VFYDsI95wMGuLvS9wKNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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