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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47012fa2c31ed1b501740fd63143385cf35009297e35fdab53dd62f872a33755' 
  AND token = '3VFRx1BsxHKxEN2UHV5orvm27E5QduEpQ1cFQA9D6yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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