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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88e9b39e9273edf6382d603f52b2cb09954c094eb1b6dee4740a014bb9d9069f' 
  AND token = 'UFhVYlrAhfee8xFcUieJVbuM0U+2n0gFvOWOmEVWwCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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