SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea336dcab439a7bdb5e2b96b00ecfe1da622831fce1471f756e691f46583757f' 
  AND token = 'dRdfm1dW7uGMTz3qiBIgF/YUbJTgJ02tCA7hJ3tkeGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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