SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48af085ed7a85079b4b558af99f67f6b0e2a283b223fb5dcd6e7fe9ce0bd73e' 
  AND token = '0FGCNGxpPMv50uQvcY1Y3TjqS+Ns03sXhnTmnULHfxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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