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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4dd16860fa36b5c82ec4b07501e05eb23ab2744037bfff37cb193a61481ad44f' 
  AND token = 'p9YeEjmbwez0crJM5urA0vkG3IjEzm1aw7/18HjVfFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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