SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8260b7b8197ff8b12ea71763f82a9026e946cd5dbad1d43d507433018bf0192b' 
  AND token = 'XS/m1Vr+meLuJDQENu049bpL5XqNugdSfsyJKkmgOgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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