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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07b7f4eea69925106f58f7d26640217d5533078d42e4f576edd2f98f4e3e40e2' 
  AND token = 'Khx4GXyJy/BSEmWfA5MBDDHgT0ayZMBRRKeUHZScNQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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