SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c985acdcc48e532066f9b790ebc9f8a1bbd4bda32efe9f5e1724430137230a46' 
  AND token = 'BihIEXwTlfruqMJptOula+Eu2YIz66aMm6Sgy0sBGz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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