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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02f45a8d486bf88f5e2106126614d8cb0b35310aac826d2d8f32ed79c1d5363c' 
  AND token = 'CuWUgskdi0tYlRTnNomuvl48nwGtqisWwN46wfi91Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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