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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cffbfada762422951b61d22cd6370b39461c77b2cb0a37504a601a3c0889db3' 
  AND token = 'vu9Udam1HmLgnKdkmkFTvtzbRUz/rf0LTMNa9YB2xjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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