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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7fd9e02631ad215d9f5425a70dd617c82e1b8227ab709a30db0da53c6cc9bb6' 
  AND token = 'VRFJNoIqh2KA1EcV0Uvwt5af4g7ASl24O479tpvKOnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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