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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a2c2bddefb4a821c8c3e5bf2c6fd2379e6e1b8fc73a34d430a8642c883ba24a8' 
  AND token = 'dr0ICifDMWdyhrD6orY4RnS3IGgJM5r8hqOz3OdBy04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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