SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0f7a94c115367c8ee7604559feb6e78bf78a25c11d67e058607fc069ad1882fb' 
  AND token = 'SRF7Byt6wEiUW/O2kRLJ20sqo9+vZ8IEHIZ/BWfYnJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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