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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c766ece773b4de795646649356d29cef7574068f66f5394bc11f440261405112' 
  AND token = 'RYIUu7g7udl3MqN3+zviUNVGXHX/NSlONUeEQnry+RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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