SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59b47ed283ef3695f2a5320e40168a880fa8103cce424cd55e17e4559f63ff9d' 
  AND token = 'qorR/0fStCPmubdQvfGuOBCD0Gz871zYSXzgG3u2wBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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