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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6271924d045087c0e36a9deba085d6ca09393dcfea83de6463439bac474d7151' 
  AND token = 'POqnzc2xyh9LS7XgKscQ3gsE7PDZbxDP9ercDqAs9/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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