SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '215ce3062d883db76d2468a85d0cc65e0004b37ea3d54fb4aa5bf26290aced16' 
  AND token = 'LdAbCwmuz858j2GA1nxhrA9wH+C4MMgsG4oqF+QqugE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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