SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fddffc36a092327982948969f3d4a491384ab180d7e6ad806c094d3626c7f9cb' 
  AND token = 'BVjKEjqjsmyHmP1oN6XJjp7FYbBJpMMGSIWh/KKn89M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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