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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82754fbc0ee3570923b227838e25a8fbc3ff559148cddb17c140129d5380121b' 
  AND token = '0enC88nZfms+ooAfTZwOsnKy8Aok1lCye2FWl5/yER4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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