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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '777a8aca7cf8e35a6a08ed69b385ed29b11b4c50569aca44d458d61dd6e794a0' 
  AND token = 'cYF6kav5OhG5i9GMoYSMAHC3W/zUyKi7tlTMmMd2uGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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