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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f63fcd69e10712334d48f7f35cd963a3653f22cc94a1e4468537671bb4c869ff' 
  AND token = 'WpT7Kos3EkfudOe7Tim8KLnUXGn7BQoHclahuowU3Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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