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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6dda6a96a3af001c201e2f5649d76c0566ab610dc418e3652f2598788329e930' 
  AND token = 'eSHtncWWQfk+BQSZLCvcnR8VgebYX/1SMiLDOVV4hbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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