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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '430705750301b302d6d47caeb3cf70da28a6b0c25335ee8eb1a4543e68ba45da' 
  AND token = 'h2EcabS5wtjoessBbE5UZQ3WAT+6JLsrrzc1TtT6pDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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