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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d5dfa9436307b6e9467de2905c7779bc3adc525231959506b143cd17b212945' 
  AND token = 'FobNAt8rbChG8zMIHHrIK++3IYGGpHuHTkwRFCFkz6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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