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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b84aacf154dc6a2779b3885223628b8eb3ce8659e1f6289fb7ad8c21cf1d1cd5' 
  AND token = 'qyoJLZnbMfQzk9Q0w0FB20KcLUCQswWLzo70eOA7IFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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