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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88acdf1fd54c04add1b899aa849d19641e2b3ecaeb0900fcd0f1654fa315967b' 
  AND token = 'iXwLrivbafUUUZq5eewdcso14NJNqXElYLppvPqqt8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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