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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '889a9c05b456fe2b8aa93a59d66119010c41fcfeb6654c2bd899da641bffda41' 
  AND token = 'M7Y3kPRdHSxjnDE6q7y/PadGx6Q7CK8eYsGW9NNPYrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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