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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0175457993720d9f5ea1ff1e049b2149bec045a0408db6e418c838120054b770' 
  AND token = '0ObkK32Sg0JsKT8jyUm5B8Dhp3mcXEqn4OZrHX9P89M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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