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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc74e287d3572c10923584a2ce0d0c3b41fce76c7bb14ecda663916a8f53e282' 
  AND token = 'JEJB6EeB9M66QHVZ/bE8Ia4/wX/uHy8jyiNwJ7ulaWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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