SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7655c4e44f0de1b2f6e49cc76d9d26659acce8273e38c1088889aca1bf0dd6e6' 
  AND token = 'EqGofjnZz8GqO84yjr8hgLKfpzP9xLknvJmdXfSzE2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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