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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f50f4315b502035e6bcbf0f7b9686b2e42500c6bcfd528b46a1ae1cf6e8aeb9c' 
  AND token = '8xqQePgnuRDjX3H4n5ruZ8rj8xfwtzt0kjz0EC4nEho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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