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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e5be665a6f93a7caa207f2d2fb8fcf2354c161889a9d56d993bc89377b8a33a' 
  AND token = 'HI+M33t9OWEaXDrOmPfqBR14IYaJyOBdcwNhxbKeomA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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