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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80c8cbd444fae2ff2a1c0ab152ba8d542691e923a776c385b0bf0d08310412cd' 
  AND token = 'Z4x5tIgvcWNF2O2CFmWnChuXk36DPAH0WE1wRew5Geg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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