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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '837172bbd67cb9abcda3b58dbe13b3947014a6729d7005a40e9de7f0517baf1d' 
  AND token = 'sfiX4agZYvaa18dyM6Z4bE2FoObJ9pjKYac8WZdUypo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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