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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '682fcdaf103fa3d60adcedec65b1cdc6702ab6fa9a50d8eb68280ab9ab92201e' 
  AND token = '/U2MRTq0cMi8wuePBtI1RLT+VjjOGkTE6lusFDEao5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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