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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c79237711b676a441b7d4f9d3e56ce38aa8882178f20e9a4bc37930e97160aee' 
  AND token = 'xJ/UfGJ3fDkeHGoj2B3+YSt0Tx2cJhg8al1eVu7kByI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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