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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '80eab3bb68f1e2d099807e2f6fe707619dadabe4ae6bd7a15cc7c3a423701e31' 
  AND token = 'Tq9C4Tm/Rb21wRtccTCwmEbY5tbZACfALgAJqFV+vng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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