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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc173098daef8599e8f9e20d378b2931471d55845008cec5a187decdb3b3c371' 
  AND token = '4EC6Ry60ceuoLKlMT+7lOG1/+H08eFXgY9LgbOAXqRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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