SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03ffb7fb2cea06546442e7c2a0c9b7680f3f28b2bec21f6a7b6554a0cbd5cbe8' 
  AND token = '+g4w/mVTl9Px8MPA4Bil7c+4KAOqmHooKYfD23wZhoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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