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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cff2f48995661f32ef5a322f6eeecc6f82fca8f3eaefec03ef15e9f5e0d17bb8' 
  AND token = 'JIFXlE+MMm9Ry3NSxDHsoNk99YIJ043TJ5eC7xO9U+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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