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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce534ce2b1da55fddf4ca50d59942eb3d231d9291305c61eab64045c371abc47' 
  AND token = 'ig1ma1fCITb3aQ25jhdqa53izuhMp5tZdJmHKX8QFhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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